268 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Hcicrograpsus marmoratus Milne Edwards, Ann. Sci. Nat., ser. 3, Zool., 



vol. 20, 1853, p. 103 [loO]. 

 Hctcroyrapsus mtdus Stimpson, Proc. Acad. Nat. Sci. Philadolpliia, vol. 10, 



1S5S, p. 104 [50], 

 Hetcrograpsus sanguineus Kingsley (not de Haan), Proc. Acad. Nat. Sci. 



Philadelphia, ISSO, p. 208. 

 Brachynotus nudus Holmes, Occas. Papers California Acad. Sci., vol. 7, 



1000, p. 81. 

 Hemigrapsxis nudus Rathbun, Amer. Nat., vol. 34, 1000, p. 587. 



Diagnosis. — ^I'wo side teeth. Sides subparallel behind. Epistome 

 with two deep notches. Chela of male with hairy patch inside. Legs 

 bare. 



Descnption. — Carapace flat and punctate behind, deflexed and 

 granulate in front. A curved line of light-colored pits arches for- 

 ward from the last side tooth to the end of the H impression. Front 

 convex, bilobed with a shallow emargination, edge thickened. Epi- 

 gastric lobes not very prominent. Antero-lateral margin strongly 

 curved, with two teeth behind the orbital tooth, intervals equal, last 

 tooth very small. 



Posterior margin of epistome with two broad, deep sinuses near 

 the outer ends. Outer margin of merus of maxilliped moderately 

 curved. Stridulating ridge composed of about 15 tubercles in the 

 male, 20 in the female; in the male they are largest in the middle, 

 most distant at the outer end; in the female they are nearly equal. 

 The ridge scrapes against a smooth horny ridge on the edge of a lobe 

 at the lower distal angle of the inner surface of the arm. 



Chelipeds smooth. Inner angle of wrist bluntly angular. Propo- 

 dus with a longitudinal ridge on the lower part of the outer surface, 

 which is stronger in the female than in the male. Palms of male 

 inflated, furnished with a patch of long fine hair at distal end of 

 inner surface, and extending on the pollex. Fingers irregularly 

 toothed, narrowly gaping in the male, tips horny. 



Legs stout, rather short, smooth, and nude. Dactyli stout, 

 scabrous, those of the last pair especially short, their tips upturned. 



Color. — Variable, generally of a mahogany red, but may be pur- 

 plish, dark red, or red marbled with white, occasionally almost 

 entirely white. Chelipeds mottled above with small, round, red spots. 

 (Holmes.) 



Measurements. — Male (32233), length of carapace 48, width of 

 same, 5G.2 mm- 



Habitat. — Among rocks near the shore. 



Range. — From Sitka, Alaska, to Gulf of California. 



Material examined. — 



Kodiak, Alaska; W. G. W. Harford; 5 male and female (32G4). 

 Doubt has been expressed as to this locality. 



